A thermos flask contains coffee. It is vigorously sheken, considering the coffee as the system. (a) Does its temperature rise ? (b) Has heat been added to it ? (c ) Has work been done on it ?A. decreasesB. increasesC. remains sameD. decreases if temperature is below `4^(@)C` and increses if temperature is equal to or more than `4^(@)C`

A thermos flask contains coffee. It is vigorously sheken, considering

1.	A thermos flask contains coffee. It is vigorously sheken, considering the coffee as the system. (a) Does its temperature rise ? (b) Has heat been added to it ? (c ) Has work been done on it ?A. decreasesB. increasesC. remains sameD. decreases if temperature is below `4^(@)C` and increses if temperature is equal to or more than `4^(@)C`
Answer» Correct Answer - B We know that there is no loss of heat in an ideal flask. Therefore mechanical energy wasted in shaking is changed into heat and hence, temperature rises.

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